#define 	DEF_AES_C
#define		FILE_NAME	"AES.C"
#include	"aes.h"
#include    <string.h>


int AesVar_Nb;
int AesVar_Nk;
int AesVar_Nr;
UBYTE AesVar_key[32];// the seed key. size will be 4 * keySize from ctor.
typedef struct UBYTE4_
{
	UBYTE w[4];
}UBYTE4;
UBYTE4 AesVar_w[4 * (14+1)];
UBYTE AesVar_State[4][4];


const UBYTE Sbox[16][16] = {  // populate the Sbox matrix
	/* 0     1     2     3     4     5     6     7     8     9     a     b     c     d     e     f */
	/*0*/  {0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76},
	/*1*/  {0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0},
	/*2*/  {0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15},
	/*3*/  {0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75},
	/*4*/  {0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84},
	/*5*/  {0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf},
	/*6*/  {0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8},
	/*7*/  {0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2},
	/*8*/  {0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73},
	/*9*/  {0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb},
	/*a*/  {0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79},
	/*b*/  {0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08},
	/*c*/  {0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a},
	/*d*/  {0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e},
	/*e*/  {0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf},
	/*f*/  {0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16} 
};

const UBYTE iSbox[16][16] = {  // populate the iSbox matrix
	/* 0     1     2     3     4     5     6     7     8     9     a     b     c     d     e     f */
	/*0*/  {0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb},
	/*1*/  {0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb},
	/*2*/  {0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e},
	/*3*/  {0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25},
	/*4*/  {0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92},
	/*5*/  {0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84},
	/*6*/  {0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06},
	/*7*/  {0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b},
	/*8*/  {0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73},
	/*9*/  {0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e},
	/*a*/  {0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b},
	/*b*/  {0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4},
	/*c*/  {0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f},
	/*d*/  {0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef},
	/*e*/  {0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61},
	/*f*/  {0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d} 
};
const UBYTE Rcon[11][4] = { 
	{0x00, 0x00, 0x00, 0x00},  
	{0x01, 0x00, 0x00, 0x00},
	{0x02, 0x00, 0x00, 0x00},
	{0x04, 0x00, 0x00, 0x00},
	{0x08, 0x00, 0x00, 0x00},
	{0x10, 0x00, 0x00, 0x00},
	{0x20, 0x00, 0x00, 0x00},
	{0x40, 0x00, 0x00, 0x00},
	{0x80, 0x00, 0x00, 0x00},
	{0x1b, 0x00, 0x00, 0x00},
	{0x36, 0x00, 0x00, 0x00} 
};



int iAes_MemoryCopy	( UBYTE	*ubpTo , UBYTE *ubpFrom	, int iCopyLength )
{
	int iIndex ;

	if ( iCopyLength >= 1024 *	3 )
	{
		//ASSERT1(0)
		return 0 ;
	}

	for	( iIndex=0	; iIndex<iCopyLength ; iIndex++ )
	{
		*ubpTo = *ubpFrom ;
		ubpTo ++ ;
		ubpFrom	++ ;
	}

	return 1 ;
}


int iAes_MemorySet ( UBYTE *ubpMemory ,	UBYTE ubSetData	, int iSetLength	)
{
	int iIndex ;

	if ( iSetLength >=	1024 * 3 )
	{
		return 0 ;
	}

	for	( iIndex=0	; iIndex<iSetLength ;	iIndex++ )
	{
		*ubpMemory = ubSetData ;
		ubpMemory ++ ;
	}

	return 1 ;
}



UBYTE gfmultby01(UBYTE b)
{
  return b;
}

UBYTE gfmultby02(UBYTE b)
{
  if (b < 0x80)
    return (UBYTE)(int)(b <<1);
  else
    return (UBYTE)( (int)(b << 1) ^ (int)(0x1b) );
}

UBYTE gfmultby03(UBYTE b)
{
  return (UBYTE) ( (int)gfmultby02(b) ^ (int)b );
}

UBYTE gfmultby09(UBYTE b)
{
  return (UBYTE)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
                 (int)b );
}

UBYTE gfmultby0b(UBYTE b)
{
  return (UBYTE)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
                 (int)gfmultby02(b) ^
                 (int)b );
}

UBYTE gfmultby0d(UBYTE b)
{
  return (UBYTE)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
                 (int)gfmultby02(gfmultby02(b)) ^
                 (int)(b) );
}

UBYTE gfmultby0e(UBYTE b)
{
  return (UBYTE)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^
                 (int)gfmultby02(gfmultby02(b)) ^
                 (int)gfmultby02(b) );
}


void RotWord( UBYTE *word )
{
	UBYTE result[4] ;
	iAes_MemoryCopy( result , word , 4 ) ;
	result[0] = word[1];
	result[1] = word[2];
	result[2] = word[3];
	result[3] = word[0];
	iAes_MemoryCopy( word , result , 4 ) ;
};


void SubWord( UBYTE *word )
{
	UBYTE result[4] ;
	iAes_MemoryCopy( result , word , 4 ) ;
	result[0] = Sbox[ word[0] >> 4][ word[0] & 0x0f ];
	result[1] = Sbox[ word[1] >> 4][ word[1] & 0x0f ];
	result[2] = Sbox[ word[2] >> 4][ word[2] & 0x0f ];
	result[3] = Sbox[ word[3] >> 4][ word[3] & 0x0f ];
	iAes_MemoryCopy( word , result , 4 ) ;
}

void AddRoundKey( int round )
{
	int r , c ;
	for ( r = 0; r < 4; ++r)
	{
		for ( c = 0; c < 4; ++c)
		{
			AesVar_State[r][c] = (UBYTE) ( (int)AesVar_State[r][c] ^ (int)AesVar_w[(round*4)+c].w[r] );
		}
	}
}

void SubUBYTEs()
{
	int r , c ;
	for ( r = 0; r < 4; ++r)
	{
		for ( c = 0; c < 4; ++c)
		{
			AesVar_State[r][c] = Sbox[ (AesVar_State[r][c] >> 4)][ (AesVar_State[r][c] & 0x0f) ];
		}
	}
}
void InvSubUBYTEs()
{
	int r , c ;
	for ( r = 0; r < 4; ++r)
	{
		for ( c = 0; c < 4; ++c)
		{
			AesVar_State[r][c] = iSbox[ (AesVar_State[r][c] >> 4)][ (AesVar_State[r][c] & 0x0f) ];
		}
	}
}
void ShiftRows()
{
	int r , c ;
	UBYTE4 temp[4];
	
	for ( r = 0; r < 4; ++r)  // copy State into temp[]
	{
		for ( c = 0; c < 4; ++c)
		{
			temp[r].w[c] = AesVar_State[r][c];
		}
	}

	for ( r = 1; r < 4; ++r)  // shift temp into State
	{
		for ( c = 0; c < 4; ++c)
		{
			AesVar_State[r][c] = temp[ r].w[ (c + r) % AesVar_Nb ];
		}
	}
}  // ShiftRows()
void InvShiftRows()
{
	int r , c ;
	UBYTE4 temp[4];
	for ( r = 0; r < 4; ++r)  // copy State into temp[]
	{
		for ( c = 0; c < 4; ++c)
		{
			temp[r].w[c] = AesVar_State[r][c];
		}
	}
	for ( r = 1; r < 4; ++r)  // shift temp into State
	{
		for ( c = 0; c < 4; ++c)
		{
			AesVar_State[r][ (c + r) % AesVar_Nb ] = temp[r].w[c];
		}
	}
}  // InvShiftRows()
void MixColumns()
{
	int r , c ;
	UBYTE4 temp[4];
	for ( r = 0; r < 4; ++r)  // copy State into temp[]
	{
		for ( c = 0; c < 4; ++c)
		{
			temp[r].w[c] = AesVar_State[r][c];
		}
	}

	for ( c = 0; c < 4; ++c)
	{
		AesVar_State[0][c] = (UBYTE) ( (int)gfmultby02(temp[0].w[c]) ^ (int)gfmultby03(temp[1].w[c]) ^
			(int)gfmultby01(temp[2].w[c]) ^ (int)gfmultby01(temp[3].w[c]) );
		AesVar_State[1][c] = (UBYTE) ( (int)gfmultby01(temp[0].w[c]) ^ (int)gfmultby02(temp[1].w[c]) ^
			(int)gfmultby03(temp[2].w[c]) ^ (int)gfmultby01(temp[3].w[c]) );
		AesVar_State[2][c] = (UBYTE) ( (int)gfmultby01(temp[0].w[c]) ^ (int)gfmultby01(temp[1].w[c]) ^
			(int)gfmultby02(temp[2].w[c]) ^ (int)gfmultby03(temp[3].w[c]) );
		AesVar_State[3][c] = (UBYTE) ( (int)gfmultby03(temp[0].w[c]) ^ (int)gfmultby01(temp[1].w[c]) ^
			(int)gfmultby01(temp[2].w[c]) ^ (int)gfmultby02(temp[3].w[c]) );
	}
}  // MixColumns
void InvMixColumns()
{
	int r , c ;
	UBYTE4 temp[4];
	for ( r = 0; r < 4; ++r)  // copy State into temp[]
	{
		for ( c = 0; c < 4; ++c)
		{
			temp[r].w[c] = AesVar_State[r][c];
		}
	}

	for ( c = 0; c < 4; ++c)
	{
		AesVar_State[0][c] = (UBYTE) ( (int)gfmultby0e(temp[0].w[c]) ^ (int)gfmultby0b(temp[1].w[c]) ^
			(int)gfmultby0d(temp[2].w[c]) ^ (int)gfmultby09(temp[3].w[c]) );
		AesVar_State[1][c] = (UBYTE) ( (int)gfmultby09(temp[0].w[c]) ^ (int)gfmultby0e(temp[1].w[c]) ^
			(int)gfmultby0b(temp[2].w[c]) ^ (int)gfmultby0d(temp[3].w[c]) );
		AesVar_State[2][c] = (UBYTE) ( (int)gfmultby0d(temp[0].w[c]) ^ (int)gfmultby09(temp[1].w[c]) ^
			(int)gfmultby0e(temp[2].w[c]) ^ (int)gfmultby0b(temp[3].w[c]) );
		AesVar_State[3][c] = (UBYTE) ( (int)gfmultby0b(temp[0].w[c]) ^ (int)gfmultby0d(temp[1].w[c]) ^
			(int)gfmultby09(temp[2].w[c]) ^ (int)gfmultby0e(temp[3].w[c]) );
	}
}

//---------------public------------------

void vAes_SetKey( ENUM_KEYSIZE keysize, UBYTE *key )
{
	int row , i , j ;
	UBYTE temp[4];

	AesVar_Nb = 4;
	switch( keysize )
	{
	case BIT128:
		AesVar_Nk = 4;
		AesVar_Nr = 10;
		break;
	case BIT192:
		AesVar_Nk = 6;
		AesVar_Nr = 12;
		break;
	case BIT256:
		AesVar_Nk = 8;
		AesVar_Nr = 14;
		break;
	default:
		AesVar_Nk = 4;
		AesVar_Nr = 10;
		break;
	}
	iAes_MemorySet( AesVar_key , 0 , sizeof(AesVar_key) ) ;
	iAes_MemoryCopy( AesVar_key, key, AesVar_Nk * 4 );	
	for(  row = 0; row < AesVar_Nk; ++row )
	{
		AesVar_w[row].w[0] = AesVar_key[4*row];
		AesVar_w[row].w[1] = AesVar_key[4*row+1];
		AesVar_w[row].w[2] = AesVar_key[4*row+2];
		AesVar_w[row].w[3] = AesVar_key[4*row+3];
	}
	
	for(  row = AesVar_Nk; row < AesVar_Nb *(AesVar_Nr + 1); ++ row )
	{
		temp[0] = AesVar_w[row-1].w[0];
		temp[1] = AesVar_w[row-1].w[1];
		temp[2] = AesVar_w[row-1].w[2];
		temp[3] = AesVar_w[row-1].w[3];
		if (row % AesVar_Nk == 0)
		{
			RotWord(temp);
			SubWord(temp);//this change two size
			temp[0] = (UBYTE)( (int)temp[0] ^ (int)Rcon[row/AesVar_Nk][0] );
			temp[1] = (UBYTE)( (int)temp[1] ^ (int)Rcon[row/AesVar_Nk][1] );
			temp[2] = (UBYTE)( (int)temp[2] ^ (int)Rcon[row/AesVar_Nk][2] );
			temp[3] = (UBYTE)( (int)temp[3] ^ (int)Rcon[row/AesVar_Nk][3] );
		}
		else if ( AesVar_Nk > 6 && (row % AesVar_Nk == 4) )  
		{
			SubWord(&temp[0]);
		}

		// w[row] = w[row-Nk] xor temp
		AesVar_w[row].w[0] = (UBYTE) ( (int)AesVar_w[row-AesVar_Nk].w[0] ^ (int)temp[0] );
		AesVar_w[row].w[1] = (UBYTE) ( (int)AesVar_w[row-AesVar_Nk].w[1] ^ (int)temp[1] );
		AesVar_w[row].w[2] = (UBYTE) ( (int)AesVar_w[row-AesVar_Nk].w[2] ^ (int)temp[2] );
		AesVar_w[row].w[3] = (UBYTE) ( (int)AesVar_w[row-AesVar_Nk].w[3] ^ (int)temp[3] );
	}//loop
	
	for( i=0;i<4;i++)
	for( j=0;j<4;j++)
	{
		AesVar_State[i][j] = 0;
	}
}

//encrypt , must align 16 UBYTE
void vAes_Cipher( UBYTE *input, UBYTE *output )
{	
	int i , round ;
	for ( i = 0; i < (4 * AesVar_Nb); ++i)
	{
		AesVar_State[i%4][i/4] = input[i];
	}
	AddRoundKey(0);

	for ( round = 1; round <= (AesVar_Nr - 1); ++round)  // main round loop
	{
		SubUBYTEs(); 
		ShiftRows();  
		MixColumns(); 
		AddRoundKey(round);
	}  // main round loop

	SubUBYTEs();
	ShiftRows();
	AddRoundKey(AesVar_Nr);

	// output = state
	for ( i = 0; i < (4 * AesVar_Nb); ++i)
	{
		output[i] = AesVar_State[i % 4][ i / 4];
	}

}

//decrypt , must align 16 UBYTE
void vAes_InvCipher( UBYTE *input, UBYTE *output )
{	
	int i , round ;
	for ( i = 0; i < (4 * AesVar_Nb); ++i)
	{
		AesVar_State[i % 4][ i / 4] = input[i];
	}

	AddRoundKey(AesVar_Nr);

	for ( round = AesVar_Nr-1; round >= 1; --round)  // main round loop
	{
		InvShiftRows();
		InvSubUBYTEs();
		AddRoundKey(round);
		InvMixColumns();
	}  // end main round loop for InvCipher

	InvShiftRows();
	InvSubUBYTEs();
	AddRoundKey(0);

	// output = state
	for ( i = 0; i < (4 * AesVar_Nb); ++i)
	{
		output[i] = AesVar_State[i % 4][ i / 4];
	}
}

void aes_ecb_encrypt( UBYTE *input, UBYTE *output , int len )
{
	while( len > 0 )
	{
		vAes_Cipher( input, output );
		
		input  += 16;
		output += 16;
		len    -= 16;
	}
}

void aes_ecb_decrypt( UBYTE *input, UBYTE *output , int len )
{
	while( len > 0 )
	{
		vAes_InvCipher( input, output );
		
		input  += 16;
		output += 16;
		len    -= 16;
	}
}


void aes_cbc_encrypt( UBYTE *iv , UBYTE *input, UBYTE *output , int len )
{
	int i;
	UBYTE iv_temp[16] ;
	
	memcpy( iv_temp , iv , 16 ) ;
	
	while( len > 0 )
	{
		for( i = 0; i < 16; i++ )
			output[i] = input[i] ^ iv_temp[i];
		
		vAes_Cipher( output, output );
		memcpy( iv_temp, output, 16 );
		
		input  += 16;
		output += 16;
		len    -= 16;
	}
}

void aes_cbc_decrypt( UBYTE *iv , UBYTE *input, UBYTE *output , int len )
{
	int i;
	UBYTE temp[16];
	UBYTE iv_temp[16] ;
	memcpy( iv_temp , iv , 16 ) ;
	
	while( len > 0 )
	{
		memcpy( temp, input, 16 );
		vAes_InvCipher( input, output );
		
		for( i = 0; i < 16; i++ )
			output[i] = output[i] ^ iv_temp[i];
		
		memcpy( iv_temp, temp, 16 );
		
		input  += 16;
		output += 16;
		len    -= 16;
	}
}
